. >> his biographer is now under fbi investigation for improperly trying to access petraeus' e-mail and classified information. she is believed to be the other woman in the affair. >> in his resignation letter to president obama, david petraeus, who took over at the cia in 2011, wrote, after being married for 37 years, i showed extremely poor judgment by engaging in an extramarital affair. such behavior is unacceptable as the husband -- as a husband and the leader of an organization such as ours. he resigned just days after his boss won reelection. president obama accepted it, saying, i wish them the very best at this difficult time. >> for lack of a better term, petraeus is a legend. one of the few generals in american history to get so much credit for some many different things. >> he was scheduled to testify on the terrorist attack in benghazi that left four americans dead, including ambassador chris stevens. >> this is probably the most politically uncomfortable, leaving aside the stuff from the affair, just the benghazi question, the most politically- uncomfortable question the guy